/*
 * -\-\-
 * Spotify Apollo API Implementations
 * --
 * Copyright (C) 2013 - 2015 Spotify AB
 * --
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * -/-/-
 */
package com.spotify.apollo.meta;

import com.spotify.apollo.Client;
import com.spotify.apollo.Request;
import com.spotify.apollo.Response;
import com.spotify.apollo.environment.IncomingRequestAwareClient;

import java.net.URI;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.CompletionStage;

import okio.ByteString;

/**
 * An Apollo {@link Client} that gethers call info to an {@link OutgoingCallsGatherer}
 */
public class OutgoingCallsGatheringClient implements IncomingRequestAwareClient {

  private final OutgoingCallsGatherer callsGatherer;
  private final IncomingRequestAwareClient delegate;

  public OutgoingCallsGatheringClient(OutgoingCallsGatherer callsGatherer, IncomingRequestAwareClient delegate) {
    this.callsGatherer = Objects.requireNonNull(callsGatherer, "callsGatherer");
    this.delegate = Objects.requireNonNull(delegate, "delegate");
  }

  @Override
  public CompletionStage<Response<ByteString>> send(Request request, Optional<Request> incoming) {
    final URI uri = URI.create(request.uri());
    final String service = uri.getAuthority();
    callsGatherer.gatherOutgoingCall(service, request);

    return delegate.send(request, incoming);
  }
}
